> >In my opinion, if you are demonstrating what some characterize as "subthreshold effects," you need to redefine the threshold.

I believe that is the point of the article.The variety of health impacts related to chemical exposures is so diverse that the concept of a “threshold value” is dubious at a practical level, although it may be necessary at the policy level.

- Ralph

Ralph Stuart, CIH, CCHO
ralph**At_Symbol_Here**rstuartcih.org

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